I am using NUI+ (Release) version... I really can,t see it anywhere. I also disable all ui to make sure there is no conflict, and still no pet action bars.

really weird

Neuralassisin is correct, you have installed the wrong version of nUI. There is no official release version yet because the 3.1 just came out and I'm still hammering down bugs. As soon as I can get the development version stable, I'll cut a release. Until then, you need to use the nUI+ Development version only.

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What people don't get is that I am, ultimately, an artist at heart. My brush has two colors, 1 and 0, and my canvas is made of silicon.